[Qgis-user] Vertex tool not working on lines when style with 'attribute' assigned

[Nicolas Cadieux]

Hi,

Open the field calculator.  By default, you will have « create a new field ».  Select « create virtual field » and use the attribute there. The virtual will be updated on the fly and is part of the project file.  If you export the file, it will be saved as a true field in the Shape file (or what ever format you are using).  

Nicolas

> Le 24 mai 2019 à 14:31, Peter Cornelissen <peter at cornelissen.org.uk> a écrit :
> 
> Hi
> 
> I have reported it as a bug, but as yet no resolution or acknowledgement that it is a bug. I was offered possible solutions but in the end it was not really answering the problem I have and since then it is just there as an open issue.
> 
> I'm not really at a level to be quite sure what you mean by using a 'virtual' field, could you please explain? The attribute method I am using was a solution given to me by someone else and as I say it worked fine when first used in version 2.8.
> 
> Peter
> From: Nicolas Cadieux <nicolas.cadieux at archeotec.ca>
> Sent: 24 May 2019 18:04
> To: Peter Cornelissen
> Cc: qgis-user at lists.osgeo.org
> Subject: Re: [Qgis-user] Vertex tool not working on lines when style with 'attribute' assigned
>  
> Hi,
> 
> This looks like a good bug report! I would do one.  Have you tried making a virtual field with the attributes?  This way, you can query two fields and not an attribute and a field. The end result would be the same but perhaps, without a bug... I have been doing that with no trouble for a couples of weeks now for a project.  Never tried doing it your way exactly.
> 
> Nicolas
> 
> Le 24 mai 2019 à 06:35, Peter Cornelissen <peter at cornelissen.org.uk> a écrit :
> 
>> Has anyone else come across this?
>> 
>> Personally I think this is a bug or possibly something wrong with my installation, but I've not had any confirmation from the QGIS team.
>> 
>> If I have a styled line or polygon and use the 'attribute' expression in the filter, then once the shapefile has been saved, closed and then re-opened, then the vertex editor does not work and I cannot edit any of the lines or polygons in the shapefile and the only way I can is to open the same shapefile without a style of with one not using attribute in the filter. I use the same shapefile numerous times and use the layer name to  display specific lines as relevant to that layer. E.g. the table has a field called Plan1801, so the layer name starts Plan1801. An example of the style is: attribute($currentfeature, left(@layer_name,8)) = 'Y' AND Type = 'Chalk'), so if a record in the shapefile table has a 'Y' in the Plan1801 column and 'Chalk' in the type column it will display as that style. If I change the style to Plan1801 ='Y' AND Type = 'Chalk' the vertex editor works fine.
>> 
>> There maybe another way around this, but there are approx. 20 different styles for the lines and a similar number for the polygons used in each layer and getting on for 30 layers (and growing) using it so I do not want to have create dedicated styles for each layer or have a separate shapefile for each layer. If there is, I have not as yet found one.
>> 
>> Any help would be appreciated.
>> 
>> I am now using version 3.6.3, but the problem has been there at least since 3.6.0, possibly earlier (not there in the old node editor in 2.8, but I know that was a completely different beast).
>> 
>> Peter Cornelissen
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